PNG (Portable Network Graphics) and ICO (Windows Icon) are built for different jobs. PNG is typically used for logos, screenshots, web graphics with transparency, while ICO is best for favicons, windows app icons. Converting lets you open, share or upload your files wherever ICO is expected.
How to use the PNG to ICO converter
- Add your PNG filesClick “Choose Files” or drag and drop them into the box. You can add many files at once — or paste a file with Ctrl+V.
- Choose ICO and adjust settingsICO is selected automatically. Optionally open Settings to change quality, size or background.
- Convert and downloadPress “Convert”. Your ICO files appear instantly — download them one by one or all together as a ZIP.
PNG vs ICO
PNG Portable Network Graphics
PNG stores raster images with lossless compression, so every pixel is kept exactly. It handles full alpha transparency, which makes it the standard choice for logos, icons, UI screenshots and graphics with sharp edges or text.
- Compression
- Lossless
- Features
- Supports transparency
- Origin
- 1996, W3C
- Best for
- Logos, screenshots, web graphics with transparency
ICO Windows Icon
ICO is the icon container used by Windows and by websites for favicons. A single ICO file can hold several sizes (16×16 up to 256×256) so the system picks the sharpest one for each place it is displayed.
- Compression
- Lossless (PNG inside)
- Features
- Supports transparency
- Origin
- 1985, Microsoft
- Best for
- Favicons, Windows app icons
Why use ConvertMathly?
Files are processed on your device and never uploaded. Close the tab and they are gone.
No account, no daily cap, no queue and no watermark — convert as much as you want.
No waiting for uploads or downloads: results are ready as fast as your device can process them.
Windows, Mac, Linux, Chromebook, iPhone and Android — any modern browser, nothing to install.
Frequently asked questions
How do I convert PNG to ICO?
Add your PNG files above, make sure ICO is selected and press Convert. The ICO files are ready to download a few seconds later — no installation or account required.
Is ICO lossless?
ICO is lossless (png inside), so your image keeps its detail.
Is there a file size or daily limit?
No. Since everything runs locally, there are no daily caps, queues or file size limits beyond what your device can handle.
Are my PNG files uploaded to a server?
No. ConvertMathly converts files entirely inside your web browser using JavaScript and WebAssembly. Your files never leave your computer or phone, which makes it safe for private photos and documents.
Can I convert multiple PNG files at once?
Yes — add as many files as you like. They are converted one after another and you can download everything in a single ZIP.